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Updated: Jun 2, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Random optical pulse generation with bistable semiconductor ring lasers.

Satoshi Sunada1, Takahisa Harayama, Kenichi Arai

  • 1NTT Communication Science Laboratories, NTT Corporation, 2-4 Hikaridai, Soraku-gun, Kyoto 619-0237, Japan. sunada@cslab.kecl.ntt.co.jp

Optics Express
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

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Researchers generated random optical pulse trains using a bistable semiconductor ring laser. This method leverages amplified spontaneous emission noise for non-deterministic random pulse sequences, passing statistical randomness tests.

Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Nonlinear Dynamics

Background:

  • Bistable semiconductor ring lasers exhibit two stable unidirectional lasing modes.
  • Modulating these lasers can lead to complex dynamic behaviors.
  • Generating true random optical pulse sequences is crucial for secure communication and random number generation.

Purpose of the Study:

  • To experimentally demonstrate the generation of random optical pulse trains from a bistable semiconductor ring laser.
  • To investigate the underlying mechanisms of randomness generation.
  • To optimize the statistical properties of the generated random pulse sequences.

Main Methods:

  • Modulating the injection current of a bistable semiconductor ring laser with a periodic pulse signal.

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Last Updated: Jun 2, 2026

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  • Switching the laser between monostable and bistable regimes.
  • Analyzing the generated optical pulse sequences for statistical randomness properties.

    • Main Results:

    • A random optical pulse train was successfully generated by modulating the bistable semiconductor ring laser.
    • The non-deterministic randomness originates from amplified spontaneous emission noise coupled to counter-propagating modes.
    • Optimization of noise sources allowed for the generation of pulse sequences passing standard randomness tests.

    Conclusions:

    • Bistable semiconductor ring lasers can serve as a source for generating non-deterministic random optical pulse sequences.
    • The method offers a promising approach for creating hardware random number generators.
    • Further research can explore applications in quantum cryptography and secure communications.